Karin and Tim are shelving books at a public library. Karin shelves 3 books at a time, whereas Tim shelves 6 at a time. If they end up shelving the same number of books, what is the smallest number of books each could have shelved?
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The total needs to have both 3 and 6 as factors, 3*4 = 2*6 = 12
1 answer